Cole and Long, Visual Discritnination in Raccoons. 671 



trials each. 'No. 3 selected it twenty -four, twenty-seven, and twenty- 

 seven times in each of three series of thirty trials. Since No. 3 

 seemed now to have learned to distinguish RVT 1 as the food-color, 

 we, at this point, returned to the use of Kinnaman's apparatus with 

 the result shown in Table 4, page 666. 



These tests completed our experiments with the papers of Group 

 5. From this group OYS 1, VBT 2, Gray 5, and EVT 1 were 

 used to cover the glass in which food was placed. The raccoons read- 

 ily learned to discriminate the food-glass from the others in each of 

 these cases. The remaining two papers of this group, VT 2 and ROT 

 1 were not used as food-colors. 



The animals were next tested on the remaining groups of Table 1 

 in the following order: Groups 25, 15, 10, 2, 20, and 30. Unless 

 otherwise stated in the tables the tests were complete in one day's 

 experiments. 



TABLE 12. 

 BS 1 in Group 25. 



TABLE 13. 

 OS 2 in Group 15. 



TABLE 14. 



OS 1 in Group 10. 



TABLE 16. 

 GBT 2 in Group 2. 



19 For a third test of thirty trials YGS 2, RT 1, and RV were substituted for BY, GB, and Gray 

 10. Both the animals selected YGS 2 twice, RT 1 once and the food color, OS 1, twenty-seven times. 



